Manufacturers include ambitious speedometers in their cars because it looks better than the truth. I remember I had an Eclipse that "went to 160"...everyone who got in my car...especially kids...was like "cool, your car does 160!"

Without modifications, your car won't "max-out" its speedometer. There isn't a special chip stopping your friend from going 140 mph.

And your friend (who later became you) doesn't need to put premium gas into his/your car. I don't believe your Hyundai has enough engine compression to warrant an octane higher than regular.

1. Simply disregard this monkey. He's been told previously that running too high octane does nothing to improve his fuel economy or performance in this thread. Oh, I forgot. It must be because it came from the bottom of the tank. Anything you try to tell him will be a waste of your time.

2. This has nothing directly to do with this thread, but when I saw "Hyundai" and "140 mph" in the same thread I remembered it. Happy reading.

3. Almost forgot. This person claims to be an "elementary school counselor", whatever that may be. I guess elementary schools need to be counseled these days. It scares me to think people of this caliber are in a position of authority over our kids.

__________________Thanks for the pic, jedimario.

"Everybody believes in something and everybody, by virtue of the fact that they believe in something, use that something to support their own existence."Frank Vincent Zappa, 1940-1993

Premium gas saves me one cent per mile. I put 350 miles on my car per week. That's about 1400 miles per month. So I save 14 dollars a month by using premium gas. Furthermore, I don't have to gas up every 4 days, but instead 9 days because of the difference in gas milage. I find that using premium gas is convenient.

A couple of times, my car tank overflowed with gas, I think I got more gas in the tank, and less air, and got better fuel economy and more fuel in the tank. I guess the slow pumping gas did not cut off because the pressure was too low.

Now, I can reach 5000+ rpm in lower gears, but not in fith gear. Is this to limit the speed limit of the car or is this simply the limit of my car?

No one with an engineering or automotive technical background will make the statements to the effect of you will not damage your car or kill someone by operating it outside the factory specifications without modifications.

If you live anywhere in the United States, Canada or most of Western Europe, there are emissions limits set by the lawmaking bodies in these individual locations. Its just some states/communities chose not to make inspections mandatory before buying license tags for the car.

So engineers and automotive techs say that operating a vehicle outside of factory specs is safe??????

Premium gas saves me one cent per mile. I put 350 miles on my car per week. That's about 1400 miles per month. So I save 14 dollars a month by using premium gas. Furthermore, I don't have to gas up every 4 days, but instead 9 days because of the difference in gas mileage. I find that using premium gas is convenient.

A couple of times, my car tank overflowed with gas, I think I got more gas in the tank, and less air, and got better fuel economy and more fuel in the tank. I guess the slow pumping gas did not cut off because the pressure was too low.

Now, I can reach 5000+ rpm in lower gears, but not in fifth gear. Is this to limit the speed limit of the car or is this simply the limit of my car?

You don't get any better fuel economy with premium...Just paying 20 cents more per gallon. You probably need 11 gallons a week, about 570 a year. That's about $120 a year...Not much, but it's definitely not saving you money.

You don't get any better fuel economy with premium...Just paying 20 cents more per gallon. You probably need 11 gallons a week, about 570 a year. That's about $120 a year...Not much, but it's definitely not saving you money.

It is saving me money, It would not be much if I didn't drive much, but since I put so many miles on my car, it ads up. If premium gas was 1 or 2 cents higher, I wouldn't be saving money. I pay two more dollars (about 10 gallons a week with premium), but I gain 28-31 mpg to 34-36 mph. I also notice a small, noticible improvement with premium gas in power.